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Oct. 16, 1923.

C. H. KNUDSEN PIISTON CONSTRUCTION Filed July 1. 1922 [Ir J I Z mmuumu! @nveutoz Patented Oct 16, 1923.

- UNITED STATES- 1,479,753 PATENT oF'FicE.

" CARLVHJ KNUDSEN, or BROOKLYN, nnwYon-x, AssieNon To run nnunsnn uo'ron CORPORATION, or WILMINGTON, DELAWARE, A CORPORATION or DELAWARE.

PISTON CONSTRUCTION.

Application fi1ed Ju1y 1,

Z oil-Z110 from it on afl/ concern."

. Be it known that I, CARL H. KNUnsnN, a'

' citizen of the United States, and; residing at Brooklyn, 'in the county of Kings'and State of New York, have invented certain new and useful Improvements in Piston Constructions, of which the following is a specifica-tion, such as will enable those skilled in the art to which it appertains tomake and use the same.

This invention relates to piston construo tions and particularly to devices of this class designed for use in connection with internal combustion engines and the object of the invention is to provide a piston construc-' tion of the classspecified, the head end por tion of which is provided with a chamber closed to the interior of the piston and having ports, communicating therewith through the periphery of the piston; a further object being to subdivide the'chamber ofthe piston by two partition walls, arranged at right angles to each other, said walls being apertured to place the subdivisions of the chamher in communication, whereby air or the :like may pass into one of the subdivisions of the chamber, through a predetermined number of the ports of the piston wall, into the other division of said chamber, through the ports in said partition walls and out through the other ports in the piston wall, for the purpo se'of cooling thehead end of the piston as well as for preheating the air, or the like, passed through the chamber; and with these and other objects in View, the invention consist-sin a piston construction of the class and for the purpose specified, which is simple in construction, efiiclent in use "and which is constructed hereinafter described and claimed.

The invention is fully disclosed in the connection with internal combustion engines piston with part oi the coni 1922. Serial no. 572,263.

and particularly to oil engines, in which air under pressure 1s passed through the cylinders ot the engine for cleaning out the same,

or for producing a scavenger effect and my V improved piston is designed for the purpose of pass ng the scavenging 11-11 through the head end, prior to its admission into thejcyl- 'inder or cylinders of the engine.

In the drawing 1' have shown one method of carrying my invention into effect and in practicel provided a piston structure 5, which is tubular in general form, and the upper end of which is closed by a substantially conical head 6, and the periphery of the piston adjacent to the head end thereof is provided with a plurality of ring grooves 7, adaptedto receive piston rings, and appronlmately centrally of the piston are wrist-pin bosses 8 having apertures 9 which in the construction shown are tapered and one of the apertures 9 1s provlded with a recess 10, and a threaded bore 11 communicating with said recess and arranged at right angles thereto. The periphery oi the piston, adjacent to the lower end thereof, is provided with a ring groove 12adapted to receive a piston ring, which acts as a wiping ring.

Above the bosses 3 the piston is provided witha transverse wall 13 which is arch shape in form in cross-section and which forms in the head end portion of the piston a closed chamber 15 divided-by two partition walls and 1 8'at either side of the partition wall lfi and these partition walls are provided with apertures 19 and 20 respectively which form a communication between the compartments 17 and 18, and the piston wall is provided with tWo intake ports 21 which com i5 and 16 into separate compartments 1'? r municate with the compartment 18 and with two exhaust ports 22 which communicate withthe compartment 17. r r

In the use of my improved piston, the intake ports 21-and exhaust por's 22 cooperate with corresponding ports in thecyl'inder in which the piston is operated and air under pressure is adapted to be passed through the cylinder ports andinto the compartment 18, through the intake ports 21- of the piston upwardly over the partition wall 15 and through the aperture 19 therein andthe aperture 20 in the partition wall 16 and then down into the compartment- 17 and outwardly through the exhaust ports 22an'd this 5 e1. Apiston of the a P $1 1 being Substantially tubular in form passage of the air through the chamber 14:

int-he head of the piston will operate to eooithe head end portion of the piston vas well as to preheat the seavengingair passed -therethrough.

It will 'also be apparent that the partition walls 15 and 1(iwili reiniforee the head end portion of the piston and will also operate as radiatlng tins and will unction to cause the 1 air to flow through the ehai'nher 14 or the compartments l7 and 18 thereof in a predetern'nned'path. It will also he understood that Iain 'notneeessarily liin'ited to the numher of intaheand exhaust ports employed nor to the specific form Of pfllftitio'ii wall con- 'truetion herein deserihecl,"and various changes therein and modifications thereof may e made within the scope of the apeh. i 0 7 pended clanns,w1thou departing trom the spirit of my invention or sacrifieingits adranta'ges.

Havlng; fully I 3i hat I' claim as new and dGSllfi'tO:SBCQI'Q by LettersPatent, iszT A class described, said and provided with aelosed head a trans verse arc-shaped partition wall at apredeennined distance from said hea d, and fornr '30 ing aflelojsed compartment in the head end portion ofthepiston, the periphery of the plptnl being provided adjacent to and above said partition wall with a plurality of spaced apertures opening into said compartmentand outwardly through the piston, Vanda 7 vertical apertured"partition wall subdividng said compartment and the apertures in said piston wall.

and proivid described lily invention;

eompartn ient and the apertures in 2. A piston of the class described; said iston being substantially tubul r in form and'proyided with a elosed heath a trans;

verse partition wall at a predetermined dis-' taneefroni said head, andtorming a closed compartment in the head end portion of the piston, the periphery oi the piston being provided adjacent to and above said parti- ,.tion wall witha plurality of spaced apertitres opening into said compartment and outwardly through the piston, and a vertical -apertured partition wall subdividing said 'eoinpertn ent and the apertures in said piston wall, the aperture of said VGItlCQhpQT- o the piston. r

' QLA piston of the KlCSCIilJCLl, said p ston being substantially tubular in form d with a i-losedhead, atrans t ion wall being adjacent to the head end I outwardly through the pirated-"a Vertical apertured partition suhdii iding Said top. w 11, the aperture of. said -vert T i H ll heing adjacent to the head end of "on, and another apertured partition at right- :ingles tosaid first named Tnv-testirnonythat I claim theioir'egoing as 30th day of June, 1922. V 1

,, I CARL KNU DSEN.-

my invention I have signed n' y name this 7 

